摘要
为了解硅和SiO_(2)的含量对脱磷的影响差异,基于Fe_(2)O_(3)-CaO-SiO_(2)-CaCl_(2)渣系在1400℃的脱磷效果,分别以硅铁和SiO_(2)作为铁水和脱磷剂的添加物,进行含磷0.3%(质量分数)铁水的脱磷试验.同时,为进一步了解两种组分在脱磷过程中的影响差异,分别以等摩尔量的硅和SiO_(2)作为铁水和脱磷剂的初始组分,进行不同时间的铁水取样试验.结果表明:随着等摩尔量的铁水初始硅含量[Si]_(i)和脱磷剂初始SiO_(2)含量(SiO_(2))_(i)的增加,硅组试验中的铁水终点磷含量[P]_(f)快速下降,而SiO_(2)组试验中的(SiO_(2))_(i)对[P]_(f)的影响并不明显.两组试验所得终渣内P_(2)O_(5)活度系数γ_(P_(2)O_(5))均下降,但硅组试验中的γ_(P_(2)O_(5))始终高于SiO_(2)组试验中的γ_(P_(2)O_(5)).此外,当[Si]_(i)和(SiO_(2))_(i)摩尔量相等时,它们对脱磷过程的影响差异集中在脱磷初期和中期,后期二者的脱磷特征则较为接近.
To understand the effect differences of silicon and SiO_(2)content on dephosphorization,based on the effect of Fe_(2)O_(3)-CaO-SiO_(2)-CaCl_(2)slags at 1400℃,dephosphorization experiments were carried out on P(0.3%,mass fraction)-containing hot metal with ferrosilicon and SiO_(2)as additives in hot metal and dephosphorizer.Meanwhile,to further understand the effect differences of the two components on the dephosphorization process,hot-metal sampling experiments at different times were carried out with equimolar silicon and SiO_(2)as the initial components of hot metal and dephosphorizer,respectively.The results show that with the increase in equimolar initial hot-metal silicon content[Si]_(i)and initial dephosphorizer SiO_(2)content(SiO_(2))i,the final hot-metal phosphorus content[P_(f)in silicon group experiment decreases rapidly,while the effect of(SiO_(2))i in the SiO_(2)group experiment on[P_(f)is not obvious.Activity coefficientsγP_(2)O_(5)of P_(2)O_(5)in final slag obtained from the two groups of experiments decrease,butγP_(2)O_(5)in the silicon group experiment is always higher than that in the SiO_(2)group experiment.In addition,when the molar amounts of[Si]_(i)and(SiO_(2))i are equal,their effect differences on the dephosphorization process are concentrated in the early and middle stage of dephosphorization,and the characteristics in the later stage are relatively similar.
作者
孙国斌
向晓东
Sun Guobin;Xiang Xiaodong(Wuhan University of Science and Technology College of Resource and Environmental Engineering,Wuhan 430081,China;Wuhan University of Science and Technology State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control,Wuhan 430081,China)
出处
《材料与冶金学报》
CAS
北大核心
2022年第6期408-413,共6页
Journal of Materials and Metallurgy
基金
武汉市应用基础研究计划项目(2016060101010071)。
关键词
铁水
脱磷
硅
二氧化硅
活度系数
hot metal
dephosphorization
silicon
silicon dioxide
activity coefficient